Material in a Wham-O Magic Window?

Back in the early 70's the Wham-O company made a toy called a Magic Window.
It's basically an oval made of a clear plastic with two panes very close

together filled with two different materials, one white and one blue. They
don't intermix very well at all and in turning the toy, lots of different
designs can be made. What is the material inside? This is something I've
been puzzled about for years, and I've Google searched with every thing I
can think of. Wham-O called it "MICRODIUM CRYSTALS", but that is obviously a
made up name as a Google search on it comes up with no usable information at
all. Basically I'd like to be able to get some of this material and make my
own "magic window". Thanks
Lane

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